Heat 2 tablespoons olive oil in large pot over medium-high heat. Add onion and minced garlic; saute 5 minutes, or until beginning to soften. Stir in carrot and celery, and cook 5 minutes more, or until onion is soft and just beginning to brown. Add oregano, basil, and parsley, and cook 1 minute. Stir in broth, and bring to a boil.